Thickened endometrium not shed after miscarriage :(

Help! Has anyone else gone through this, I am so upset. I lost what would have been our second blessed litte baby last week - early scans showed there was a second empty sac which may have caused issues with retaining the pregnancy from the start. I got to 11 weeks and then started to bleed. Two days later what would have been came out and I was sooooo not prepared for what happened as the midwife did not tell me the truth and really underplayed it. Anyhow, I returned 10 days later for a scan to check it was all gone else I was going to have a D&C - I had no retained products but the lining of the uterus was not shed - it is still 15mm thick and as I stopped bleeding 2 days ago, it appears to be in there to stay. This is distressing to me as it is holding me back from feeling as if this is over. I have another scan in 9 days to check again. The midwife said it was 'disorganised' in there and if it had been 17mm they would have scheduled the operation. As it is I am now on another distressing wait and see. Does anyone know what will happen/likely to happen/why this is clinging on in there? Any words of wisdom? Much appreciated any sharing, Suzie xxxx